Synthesis, mesomorphism, photophysics and device performance of liquid-crystalline pincer complexes of gold(<scp>iii</scp>)
作者:Rachel R. Parker、Denghui Liu、Xiankang Yu、Adrian C. Whitwood、Weiguo Zhu、J. A. Gareth Williams、Yafei Wang、Jason M. Lynam、Duncan W. Bruce
DOI:10.1039/d0tc04839a
日期:——
the condensed phase. Solution NMR studies show a preferred orientation for self-association, consistent with structural parameters in the liquid crystal phase obtained by X-ray methods. While the pattern of substitution of the phenylacetylide has no discernible effect on the photophysics, when two alkoxy chains are attached to the pincer ligands, photoluminescence quantum yields (PLQY) of around 3% are
发光金(III)也带有苯基乙酰胺配体的2,6-二苯基吡啶的螯合剂的络合物在钳子和苯乙炔化物上均已被修饰以赋予液晶性质,大多数络合物在缩合相中显示出柱状六方相。溶液NMR研究表明自缔合的优选取向与通过X射线方法获得的液晶相中的结构参数一致。尽管苯乙炔化物的取代模式对光物理没有明显影响,但是当两个烷氧基链连接到钳形配体时,发现的光致发光量子产率(PLQY)约为3%,而当四个烷氧基链连接时,PLQY会增加明显达到36%。来自计算化学的见解表明,烷氧基供体基团的引入提高了基于钳子的HOMO-1轨道的能量,同时伴随着LUMO←HOMO-1过渡能的降低,这与实验观察到的红移一致。使用溶液处理方法将金络合物制成OLED器件,然后将其掺入5%的发光层中,从而使外部量子效率高达7.14%,该值与文献中相关络合物的性能相当。